/*---------------------------------------------------------------------------*\
  =========                 |
  \\      /  F ield         | foam-extend: Open Source CFD
   \\    /   O peration     | Version:     4.1
    \\  /    A nd           | Web:         http://www.foam-extend.org
     \\/     M anipulation  | For copyright notice see file Copyright
-------------------------------------------------------------------------------
License
	This file is part of foam-extend.

	foam-extend is free software: you can redistribute it and/or modify it
	under the terms of the GNU General Public License as published by the
	Free Software Foundation, either version 3 of the License, or (at your
	option) any later version.

	foam-extend is distributed in the hope that it will be useful, but
	WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
	General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with foam-extend.  If not, see <http://www.gnu.org/licenses/>.

\*---------------------------------------------------------------------------*/

#include "geomDecomp.H"

// * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //

Foam::geomDecomp::geomDecomp
(
	const dictionary& decompositionDict,
	const word& derivedType
)
:
	decompositionMethod(decompositionDict),
	geomDecomDict_(decompositionDict.subDict(derivedType + "Coeffs")),
	n_(geomDecomDict_.lookup("n")),
	delta_(readScalar(geomDecomDict_.lookup("delta"))),
	rotDelta_(I)
{
	// Check that the case makes sense
	if (nProcessors_ != n_.x()*n_.y()*n_.z())
	{
		FatalErrorIn
		(
			"geomDecomp::geomDecomp"
			"(const dictionary& decompositionDict)"
		)   << "Wrong number of processor divisions in geomDecomp:" << nl
			<< "Number of domains	: " << nProcessors_ << nl
			<< "Wanted decomposition : " << n_
			<< exit(FatalError);
	}

	scalar d = 1 - 0.5*delta_*delta_;
	scalar d2 = sqr(d);

	scalar a = delta_;
	scalar a2 = sqr(a);

	rotDelta_ = tensor
	(
		d2,		 -a*d,		 a,
		a*d - a2*d,  a*a2 + d2,  -2*a*d,
		a*d2 + a2,   a*d - a2*d,  d2 - a2
	);
}


// ************************************************************************* //
